Grinding wheel dresser



July 21, 1964 s. J. KOPEC GRINDING WHEEL DRESSER 3 Sheets-Sheet 1 Filed Aug. 28 1961 INVENTOR.

TANLEY J Ko PEG 0 M KM? July 21, 1964 s. J. KOPEC 3,141,452

GRINDING WHEEL DRESSER Filed Aug. 28, 1961 4 3 Sheets-Sheet 2 INVENTOR. 57% -47 Wofisc July 21, 1964 5. J. KOPEC 3,141,452

GRINDING WHEEL DRESSER Filed Aug. 28, 1961 3 Sheets-Sheet 3 v INVENTOR.

STANI. Ev J KQP United States Patent 3,141,452 GRINDING WHEEL DRESSER Stanley 1. Kopec, 577 Randolph St, Northville, Mich. Filed Aug. 28, 1961, Ser. No. 134,498 6 Claims. (til. 125 -11) This invention relates to grinding wheel dressing machines and, more particularly, to machines for dressing grinding wheels for use in grinding gears and for moving a tool through a path for making a shape on a wheel for grinding involute teeth.

Prior machines for the foregoing purposes were complicated, expensive, and difficult to operate accurately.

The present invention contemplates the use of a grinding wheel dressing device employing a diamond cutting member which is supported to move generally through an involute path. As the diamond cutting member moves in an arcuate path generated by an arm supporting it, the supporting member is moved to modify the movement of the cutting member to cause the diamond cutting member to move in an involute path or in a path of some other desired shape.

It is, accordingly, an object of the present invention to provide an improved tool holding device.

Another object of the invention is to provide a means for moving a cutting tool through a predetermined curvilinear path by means of an arm which rotates the tool and another arm modifying the rotation of the first arm.

A further object of the invention is to provide a wheel dresser which is simple in construction, economical to manufacture, and simple and efiicient in operation.

With the above and other objects in view, the present invention consists of the combination and arrangement of parts hereinafter more fully described, illustrated in the accompanying drawings and more particularly pointed out in the appended claims, it being understood that changes may be made in the form, size, proportions, and minor details of construction without departing from the spirit or sacrificing any of the advantages of the invention.

In the drawings:

FIG. 1 is a front view of a machine according to the invention;

FIG. 2 is a view of the diamond support;

FIG. 3 is a side view of the wheel dresser device;

FIG. 4 is an enlarged side view of the tool moving linkage; and

FIG. 5 is an exploded view of certain parts of the device.

Now with more particular reference to the drawings, the present machine provides means to move a diamond point in a modified arcuate path relative to a grinding wheel peripheral edge. An arm 14 rotatably receives a cylindrical portion 82 of a diamond support 4. The arm 14 swings an arm 19 around an axle 76 while the arm 19 rotates the diamond support 4. Therefore, a diamond cutting member 83 is swung about the center of the cylindrical portion 82 and the cylindrical portion 82 is itself swung about the center of the axle 76. The degree of each said swinging movement is determined by the contour of a template 12. The diamond cutting member 83 is indirectly supported on an arbor by the intermediate structure abovereferred to. The arbor 10 has a mandrel 30 thereon with a grinding wheel 31 attached thereto which is to have its outer peripheral surface dressed to conform to the shape suitable to grind an involute shape along each side adjacent the periphery thereof so that the wheel can be used to grind involute teeth. By suitable shaped movable templates, the shape of the periphery of the grinding wheel can be varied through a variety of predetermined curves.

The arbor 10 has a support bracket 1 clamped thereto. The support bracket 1 has a bored boss 49 on its lower end which receives the arbor 10 and it is slotted at 41 3,141,452 Patented July 21, 1964 and clamp screws 42 clamp it onto the arbor 163. The support bracket 1 has upwardly extending ways 43 thereon which receive complementary shaped ways 59 on a vertical slide 2.

The vertical slide 2 has a generally rectangular body portion with an car on the inside thereof which receives a screw 18 between a stop 17 and an adjustable stop 52. The lower end of the screw 18 is received in a threaded hole 44 in the support bracket 1. The upper end of the screw 18 has a calibrated graduated dial 15 thereon by which a pointer 56 indicates the position of the screw relative to the grinding wheel.

A forwardly extending bracket 53 supports a bored boss 54 on the vertical slide 2. The bored boss 54 has a bore 55 therein which receives a cylindrical journal 61 on a cross slide support 1th. The pointer 56 is fixed to the vertical slide 2 and the point on the upper end thereof may be directed to a calibration marked on the periphery of the graduated scale 15 on a member 16 to enable the operator to return the setting to the same position. The cross slide support 10' has an upper rectangular member having generally V-shaped ways 66 thereon.

The horizontal cross slide support 19' has a flat top surface 62. The V-shaped ways terminate at their lower sides in vertically extending sides 64. The cross slide support 10' is received in complementary shaped V-shaped grooves in a cross slide 11 and the cross slide 11 is fixed to a rotatable body 3. A screw 22 extends through the side of the cross slide and can be tightened to lock the cross slide in position on the ways.

The cross slide is provided to move the rotatable body 3 forwardly and rearwardly longitudinally with respect to the arbor 10 through the cross slide support 10' in order to adjust the position of the cutting tool or diamond to accommodate different thicknesses of wheels to be dressed. A stop plate 21 is fixed to the rear end of the cross slide 11 and it overlies the rear end of the cross slide support 10 to limit the forward movement thereof. The rearward movement of the cross slide 11 is limited by a stop pin 22' which is fixed to the cross slide 11 and engages the front surface of the slide support 10'.

The rotatable body 3 rotates about the axial center line of the cylindrical journal 61 (FIG. 3) and has an upwardly extending, generally flat plate 71' which has a reinforcing web 71 and a laterally extending web 7 2 which is fixed to the cross slide 11. The fixed template 12 is attached to the fiat plate 71'. The lower end of a rotatable member 90, from which the arm 14 extends, rotates in an axial bore in a boss 74 which receives the axle 76 of the body carrying the fixed pivot. The boss 74 is fixed to the plate 71. The axle 76 is fixed to a fixed pivot support 7 and the fixed pivot support 7 is in turn fixed to the fixed pivot arm 14. The fixed pivot arm 14 rotates the fixed pivot axle 76 in the boss 74. A collar 77 can be attached to the outer end of the fixed pivot axle 76 to hold it in place.

The template 12 is fixed to the fiat plate 71. The template 12 has a contoured surface 78 which is formed to modify the path of movement of the diamond cutting member 83. If the surface 78 were not contoured, the diamond cutting member 83 would move in a generally arcuate path generated by the rotation of the crank arm 19. The pivot arm 14- to which the movable template 13 having contours 78' is fixed is urged toward the fixed template 12 by a spring 79. The spring 79 is connected at one end to the movable template 13 and at the other end to the fixed template 12 so that a guide roller 81 carried by a link 8 is squeezed between the templates. When the link 8 moves up and down, as will be hereinafter described, the guide roller 81 will force the arm 14 away from the fixed template 12 and the spring 79 will move it toward the fixed template.

The diamond support 4 has a cylindrical portion 82 and a rectangular portion $2. In the rectangular portion is a hole 84 in which a diamond holder 85 is clamped in position by a screw 86. The diamond cutting member 83 is mounted in the end of the diamond holder 35.

The cylindrical portion 82 is supported in precision anti-friction hearings in a boss 87 on the rotatable member 9h. The member 90 has the pivot arm 14 fixed thereto. A disk 93 having a boss 92 is fixed to the cylindrical portion 82 of the diamond support 4. The crank arm 19 is fixed to the disk 93 by bolts M which are threaded into the arm 19. The bodies of the bolts are received in slots 91 and the heads thereof overlie a part of the disk 93. The cylindrical portion 82 is supported in precision antifriction hearings in a boss 87. The bolts 94 may be loosened to rotate the arm 19 relative to the disk 93 in order to get the diamond to the exact initial aligned position relative to the vertical axis of the grinding wheel to be dressed.

The link 8 is pivotally connected to the arm 19 by a pin 96 through a precision bearing and the distal end of the link 8 has a member 97 fixed thereto. The member W carries the roller 81 on the outer end thereof, which roller slides between the fixed template 12 and the movable template 13. The weight of the arm 19 is balanced by a spring 89 which is connected to the arm 19 at its lower end and to the fixed template 12 at its upper end.

The length of the arm 19, the length of the diamond holder portion 85, as well as the length of the arm 14, are important and the ratio thereof determines the path of movement of the diamond.

In operation, the diamond is moved upwardly or downwardly to a proper vertical position by rotation of the member 16 which is fixedly mounted on the screw 18. The amount of movement is determined by the position of the calibrated graduated scale 15 relative to the pointer 56. The bolts 4 are loosened and the disk 93 is rotated to bring the diamond holder 85 to the proper position and the bolts subsequently retightened.

Then the device is swung about the cylindrical journal 61 in the boss 54 to bring the diamond to one side of the wheel and it is slid backward on the slide support to the proper position to bring the diamond directly over the central axis of the wheel and to accommodate the correct thickness of the wheel. Then the wheel is driven by means of a motor M and the operator rotates the diamond arm disk 93 with his hand. This causes the roller on the link 8 to swing up and down between the templates 1?; and 13 and further causes the template fixed to the arm 14 to rotate the arm in a path modified by the contoured surfaces of the templates. Thus, the movement of the arm 14 modifies the movement of the diamond and by correctly shaping the contoured surfaces '78 and 78', the diamond can be moved in an involute path.

Both or either template can be used to modify the form dressed on the wheel. When either template is straight and the form is on the other, the straight template is simply a device for maintaining contact of the follower and both templates.

When one side of the wheel is dressed, the entire device can be raised to get the diamond above the wheel. Then the device can be rotated on journal 61 to bring the diamond on the other side of the wheel so that the other side can be dressed in like manner.

The foregoing specification sets forth the invention in its preferred practical forms but the structure shown is capable of modification within a range of equivalents Without departing from the invention which is to be understood is broadly novel as is commensurate with the appended claims.

The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:

1. A machine for dressing a rotatably supported grinding wheel comprising a diamond point, means to swing said diamond point in a predetermined path, said swinging means comprising a support for said diamond point rotatably journalled in a bearing and having a rotating arm operably attached thereto, said arm having a linkage connected thereto at one end thereof, said support for said diamond point being swingably connected to said machine by said linkage, a fixed pivot arm attached to said bearing and having a template on the distal end thereof, and a member on the end of said linkage cooperating with said template and urging said diamond point to move in said predetermined path as said linkage rotates to rotate said rotating arm whereby said point is moved in a path modified by the movement of said rotating arm.

2. The machine recited in claim 1 wherein said rotating arm is attached to said support for said diamond point at an angle of approximately ninety degrees to the axis of rotation thereof, and said linkage comprises a single link swingably attached to the distal end of said rotating arm at one end and said member on the other end thereof.

3. The machine recited in claim 1 wherein said diamond point is swingable about an axis disposed at substantially ninety degrees to the axis of rotation of said grinding wheel.

4. The machine recited in claim 1 wherein said hearing is journalled in the distal end of said fixed pivot arm.

5. A wheel dresser for dressing a grinding wheel rotatably supported on an arbor wherein the dresser is supported upon the arbor by a bracket means, the dresser comprising a vertical slide on said bracket means, means to adjust said vertical slide up and down on said bracket means, a cross slide support rotatably mounted on said vertical slide, a cross slide supported on said cross slide support, a dressing member, means to support said dressing member on said cross slide, said means to support comprising a shaft rotatably received in a journal member, means to control the rotation of said shaft to rotate about the axis of said shaft, a variable axis ofiset from said axis, said shaft being swingable about said oifset axis, a crank arm fixed to said journal member, a link swingably connected to said crank arm, a pivot arm swingably connected to said crank arm, said pivot arm supporting said journal member and having a template on the distal end thereof, and a guide member on the distal end of said link slidably received between said template and a fixed template to rotate said journal member and thereby swing said dressing member about the axis of said journal member to cut a contour on the edge of said grinding wheel.

6. The dresser recited in claim 5 wherein said cross slide is supported on said vertical slide for rotation about a vertical axis whereby said dressing member can be swung from one side of said wheel to the other.

No references cited. 

1. A MACHINE FOR DRESSING A ROTATABLY SUPPORTED GRINDING WHEEL COMPRISING A DIAMOND POINT, MEANS TO SWING SAID DIAMOND POINT IN A PREDETERMINED PATH, SAID SWINGING MEANS COMPRISING A SUPPORT FOR SAID DIAMOND POINT ROTATABLY JOURNALLED IN A BEARING AND HAVING A ROTATING ARM OPERABLY ATTACHED THERETO, SAID ARM HAVING A LINKAGE CONNECTED THERETO AT ONE END THEREOF, SAID SUPPORT FOR SAID DIAMOND POINT BEING SWINGABLY CONNECTED TO SAID MACHINE BY SAID LINKAGE, A FIXED PIVOT ARM ATTACHED TO SAID BEARING AND HAVING A TEMPLATE ON THE DISTAL END THEREOF, AND A MEMBER ON THE END OF SAID LINKAGE COOPERATING WITH SAID TEMPLATE AND URGING SAID DIAMOND POINT TO MOVE IN SAID PREDETERMINED PATH AS SAID LINKAGE ROTATES TO ROTATE SAID ROTATING ARM WHEREBY SAID POINT IS MOVED IN A PATH MODIFIED BY THE MOVEMENT OF SAID ROTATING ARM. 